I'm totally stuck, too. Been in the right hand side of the Pyramid of the Sky for over a game day. Haven't been able to find the key for the left side. There are a few smallish dark areas left but I can't figure out how to access them. No key spots. No areas to "explore" or "investigate". I've tried sitting at the desk, fishing in the waters (can't find a spot where the mummy fish are, either), in short, everything I can think of. Please help!